Try here http/www.firstlightdirect.com/T5-Lamp-Lead-Length-2m-IP67-ULTRA-SEAL-Lamp-Leads-Waterproof-IP67-PAIR_A105Y2.aspx
or buy the whole unit good brand very cheap http/www.allpondsolutions.co.uk/aquarium-1/aquarium-lighting/aquarium-t5-lighting.html